He walked upstairs to his apartment and minutes later he saw a gruesome sight.

“I come back and there’s somebody laid out on the ground,” Walters said.

Police say there have been more than a dozen unsolved beatings in Denver in the past few months, with some believed to be gang-related. Apartment manager Anna Bebutova says the assault is an isolated incident.

“I don’t feel any less safe and I don’t think my residents do as well,” Bebutova said.

Police say it’s too early to know if the latest case is related to the others, but as in the other cases, the suspects are considered extremely dangerous.

“Those are individuals we want to contact, locate and get off the street,” Det. John White with Denver police said.

Meanwhile, another unsolved beating has a neighborhood on edge.

“I like the neighborhood, I like where I live, but seeing stuff like that makes me feel unsafe,” Walters said.

Denver police are investigating two other attacks early Sunday morning near 15th and Market in LoDo. The two victims were found on different corners and both suffered serious injuries. Police want to talk to any witnesses to the assaults.